Write on a text file from QString

[Malek]

Hi guys ...

I just want to write on a text file from QString and view this file for the user.
I tried again and again.And saw the links which the forum suggest but no output.
The problem that make me angry is Error without line nuber which says:
mainwindow.o ERROR1
!!

This is one of my tries:

void MainWindow::on_pushButton_clicked()
{
    QString str = "Malek";
    QFile file ("hello");
    QTextStream outstream(&file);
    outstream << str;
}

void MainWindow::on_pushButton_clicked()
{
    QString str = "Malek";
    QFile file ("hello");
    QTextStream outstream(&file);
    outstream << str;
}

To copy to clipboard, switch view to plain text mode 

Can you help me ,Please.

[Lykurg]

You might want open the file for writing. See the QFile and QTextStream detailed description in the docs.

[SixDegrees]

Another note: if you compile in 'release' mode, your error messages may not have information like source line numbers available, depending on the system and compiler used. During development, you should be building in 'debug' mode to ensure that more detailed information is made available.

[Malek]

Thanks Lykurg.
Thanks SixDegrees.

The problem has been solved. I will put the soln here soon.